The Atlantic Group uses the OPTECH 3100 LiDAR Mapping Systems to collect surface elevation data that is processed to create various LiDAR-based model data sets. Our Optech 3100 is mounted in our Cessna 210 aircraft. LiDAR is an airborne laser system that is used to acquire X, Y, and Z coordinates of the earth’s terrain surface and other surface features that are both natural and manmade. Because light travels at a constant speed, the range distance between the sensor and the reflector can be measured and recorded in terms of the time that it takes for emitted light to travel to a reflector on the earth’s surface and return to the sensor. Also considered are the sensor’s scan width, weather conditions, desired point density and other factors. In addition to the measurement of range, other critical data recorded includes the ABGPS three-dimensional space location of the sensor and the IMU that delivers precise information about the attitude (rotation) of the sensor at its space location. The enormous number of data points collected during a LiDAR mission are processed to develop three dimensional surface models that meet client requirements and project needs. Most often, LiDAR data is processed to create Bare Earth DEMs that are used to generate surface models from which accurate topographic contours can be generated and/or to serve as surfaces to which aerial images can be differentially rectified to create digital orthophotos. Other LiDAR data models include tree canopy definition, volumetrics, airfield obstruction studies, and others.
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